JAVA中BufferedImage的用法

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1.用到的包

public static void main(String[] args) {     // TODO Auto-generated method stub       int width = 100;       int height = 100;    // 1.创建一个不带透明色的BufferedImage对象     BufferedImage bimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);       // 2.创建一个带透明色的BufferedImage对象      bimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);     // 3.创建一个与屏幕相适应的BufferedImage对象     GraphicsEnvironment ge = GraphicsEnvironment .getLocalGraphicsEnvironment();      GraphicsDevice gs = ge.getDefaultScreenDevice();      GraphicsConfiguration gc = gs.getDefaultConfiguration();     // Create an image that does not support transparency      bimage = gc.createCompatibleImage(width, height, Transparency.OPAQUE);      // Create an image that supports transparent pixels      bimage = gc.createCompatibleImage(width, height, Transparency.BITMASK);       // Create an image that supports arbitrary levels of transparency     bimage = gc.createCompatibleImage(width, height,                Transparency.TRANSLUCENT);   }   // 4.当然我们也可以在图形上下文来创建一个BufferedImage对象  public void paint(Graphics g) {       Graphics2D g2d = (Graphics2D) g;       int width = 100;       int height = 100;      // Create an image that does not support transparency      BufferedImage bimage = g2d.getDeviceConfiguration()                              .createCompatibleImage(width, height, Transparency.OPAQUE);       // Create an image that supports transparent pixels      bimage = g2d.getDeviceConfiguration().createCompatibleImage(width,                height, Transparency.BITMASK);      // Create an image that supports arbitrary levels of transparency      bimage = g2d.getDeviceConfiguration().createCompatibleImage(width,                height, Transparency.TRANSLUCENT);   }}2.使用BufferedImage的图像剪裁： public static void main(String[] args) {   try {   //从特定文件载入   BufferedImage bi = ImageIO.read(new File("c:\\test.jpg"));   bi.getSubimage(0, 0, 10, 10);  } catch (IOException e) {   e.printStackTrace();  }

2.如何取到BufferedImage

BufferedImage image = ImageIO.read(new File("1.gif"));

3.BufferedImage ---->byte[]

ImageIO.write(BufferedImage image,String format,OutputStream out);方法可以很好的解决问题；

参数image表示获得的BufferedImage；

参数format表示图片的格式，比如“gif”等；

参数out表示输出流，如果要转成Byte数组，则输出流为ByteArrayOutputStream即可；

执行完后，只需要toByteArray()就能得到byte[];

4.显示BufferedImage

public void paint(Graphics g){
    super.paint(g);
    g.drawImage(image);    //image为BufferedImage类型
}

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